Systems and methods for reducing variations in received signal strength indicator (RSSI) measurements for location sensing
Certain embodiments herein are directed to reducing variations in received signal strength indicator (RSSI) measurements that may be received by a wireless device over a network, such as a WiFi network including one or more access points. A signal sent from an access point may be received by a user device, where channel estimation results associated with the received signal may be analyzed to determine a more accurate location of the user device. The received signal may be converted to at least one of the time domain and the frequency domain, in which signal components associated with the received signal may be identified based on a determination that the signal components may be associated with multipath fading or other types of interference. Such identified signal components, whether in the frequency domain or the time domain) may be excluded from a determination of a signal strength measurement that may in turn be used to identify the location of the user device.
1. A device, comprising:
at least one memory that stores computer-executable instructions; and
at least one processor configured to access the at least one memory, wherein the at least one processor is configured to execute the computer-executable instructions to:
receive, over the network from one or more access points, a signal comprising multiple signal components;
convert the signal to a frequency domain signal such that the multiple signal components are associated with a first respective power value and a frequency;
convert the signal to a time domain signal such that the multiple signal components are associated with a second respective power value and a time unit;
determine a first signal strength measurement associated with the frequency domain signal based at least in part on the first respective power value;
determine a second signal strength measurement associated with the time domain signal based at least in part on the second respective power value; and
determine a combined signal strength measurement based at least in part on the first signal strength measurement and the second signal strength measurement.
2. The device of claim 1 , the at least one processor further configured to determine a location of the user device based at least in part on the combined signal strength measurement.
3. The device of claim 1 , wherein the determination of the first signal strength measurement comprises the at least one processor being further configured to:
identify at least a portion of the multiple signal components in the frequency domain signal having a respective power value that is located in a valley portion of the signal or a different respective power value that differs from a power value associated with a preceding portion by more than a threshold value;
wherein the determination of the first signal strength measurement does not include the at least a portion of the multiple signal components.
4. The device of claim 1 , wherein the determination of the second signal strength measurement comprises the at least one processor being further configured to:
identify a dominant component in the time domain signal based at least in part on the second respective power value associated with the multiple signal components.
5. The device of claim 1 , wherein the signal is modulated via Orthogonal Frequency Division Multiplexing (OFDM).